Unhappy

Good day ,I had a credit card with fnb went on debt review in 2016 but they handed me over to their Attorneys. Then In December 2018 i started paying the account directly to my fnb credit card it started from 5000 i managed to bring it down to 1500 in March 2019 then suddenly in April i got a call from their Attorneys stating i owe 5000 and they only received 200 from .i informed them that i was paying directly to my credit card until the balance was 00.00 now on the 22-11-2019 they say i owe 6000.tried calling their Attorneys but no answer I informed them that I was not well and even now I'm in hospital. But willing to pay that 1200 which I don't understand why.